![]() ![]() If you however want to connect a BSP pipe to an NPT pipe or fitting, there are adapters in the market for that purpose. That is the mean reason BSP and NPT threads shouldn’t be used together. In sensitive services like the oil and gas industry where pressure of the hydrocarbons can reach 15000 pounds per square inch (psi), a leaking pipe connection can be catastrophic. Connecting them together will therefore result in thread misalignment, damage and leaks. Also, the thread angle in NPT is 60 0 unlike BSP’s 55 0 meaning the 2 threads have dissimilar pitches. NPT threads’ crests and roots are pointed compared to BSP’s rounded ones. One question I’ve always been asked when talking about these two forms of threads is “Can you connect a fitting with BSP threads to a pipe with NPT threads provided they are of the same size”? NPT threads are also pointed at the crests and roots whereas BSP’s are rounded. The main difference between NPT and BSP threads is that the thread angle in NPT threads is 60 degrees while that of BSP pipes is 55 degrees. NPT threads are used in the United States and Canada while BSP threads are used in United Kingdom and many countries in Europe, Asia and Africa.īut what is the main difference between NPT and BSP threads? How can you tell them apart? So, what is the difference between NPT and BSP?Īctually, the difference in NPT and BSP is not in how much one form of thread is better than the other or how one is used but rather where each form of thread is used. The two main types of pipe thread styles are National Pipe Thread (NPT) and British Standard Pipe (BSP). Pipe thread forms in the United States is different to that of the United Kingdom. I was writing an article about the different types of thread sealants and I remembered that all threads are not created equal. ![]()
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